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Michelle M. Sulikowski; Kyungjin Kim; Gary A. Sulikowski; Srinivan Nagarajan; D.Scott Linthicum. (1995). Ligands for the study of sweet taste receptors: Synthesis of fluorescent N,N′-disubstituted guanidineacetic acids. , 5(23), 2875–2878. doi:10.1016/0960-894x(95)00501-j 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research